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3 2504121445 Energetics, Inc. 23-21 Federal (M2653) Hill Co. KB 4,000 ft Wildcat 4 2504121617 Gas Producing Enterprises 43-23 Olson Hill Co. KB 4,412 ft Wildcat U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY 1 2501521037 Montana Power Company 8-8 Hettrick Chouteau Co. KB 3,065 ft Wildcat 2 2504121619 Montana Power Company 3-8 Rocky Boy Hill Co. KB 3,566 ft Bullwacker Bearpaw Shale Fox Hills Sandstone Hell Creek Formation A WEST ells 1 and 2 are on the Rocky Boys Indian Reservation Judith River Formation Series Formation or Member Bears Paw Mountains Sec. 08, T. 29 N., R. 14 E. Sec. 08, T. 29 N., R. 15 E. W Sec. 21, T. 29 N., R. 16 E. Sec. 23, T. 29 N., R. 16 E. 1 Skull Creek Shale 1 2 2 mi 2 mi TD 2,479 ft Cretaceous Belle Fourche Shale Initial production: SI gas Prod. zone: Judith River Formation 1,236-1,423 (gross) Perfs.: 1,236-38, 1,294-98, 1,301-04, 1,416-23 DST: 1,294-1,440 (Judith River); SI 30 min., open 2 hr, SI 1 hr; gas in 10 min @ 2.7 MCFGPD, incr. to 3.3 MCFGPD in 2 hr; rec. 70 ft GCM; FP 9-18, SIP 150-394, HP 767-767 3 4 2 Stratigraphic note: 1. Operator's pick of Fox Hills Sandstone at 50 ft 2. Operator's pick of sill from 2,078 to 2,188 3. Operator's pick of metamorphic 6 mi 7 mi Claggett Shale Eagle Sandstone and Telegraph Creek Formation Niobrara Formation Carlile Shale Greenhorn Formation Belle Fourche Shale Mowry Shale Muddy Sandstone Shell Creek Shale Basal silt unit of Skull Creek Shale Fall River Sandstone LOWER CRETACEOUS UPPER CRETACEOUS Sandstone Judith River Formation 4 5 1 1 3 Mosby Member 2 TD 2,305 ft Cretaceous Skull Creek Shale Drilled and Abandoned No DST TD 2,242 ft Cretaceous Skull Creek Shale Drilled and Abandoned No DST Stratigraphic note: 1. Operator's note indicates that the faulted top of the Belle Fourche Shale is in contact with volcanic rocks at 1,596 ft, and that volcanic rocks extend to the surface. Stratigraphic note: 1. Operator's note indicates volcanic rocks from surface to truncated Claggett Shale 2. Operator's pick of Telegraph Creek Formation at 898 ft TD 3,675 ft Mississippian Madison Limestone Drilled and Abandoned DST: 1,035-1,095 (Eagle); SI 30 min., open 1 hr 30 min., SI 1 hr 30 min; rec. 500 ft MCW; FP 70-285, SIP 358-358, HP 590-582 Stratigraphic note: 1. Operator's pick of Virgelle Sandstone Member of Eagle Sandstone at 1,161 ft 2. Operator's pick of Colorado Shale at 1,400 ft 3. Operator's pick of Bow Island Formation at 2,351 ft 4. Operator's pick of Dakota Formation at 2,798 ft 5. Operator's pick of Lakota Formation at 3,198 ft rocks from 2,188 to 2,212 4. Operator's pick of Colorado Shale at 2,212 ft 5. Operator's pick of sill from 2,346 to 2,362 ft Igneous intrusive rock apparently has replaced much of the Eagle Sandstone, Niobrara Formation, and Carlile Shale in this well. The operator picked Greenhorn Formation at 2,278 ft. Kootenai Formation Jurassic rocks JURASSIC 5 5 3 Shell Creek Shale Judith River Formation 5 2504121457 Energetics, Inc. 1 Edith Sec. 18, T. 29 N., R. 17 E. Hill Co. KB 4,032 ft Wildcat 6 2500505006 Pan American Petroleum 1 Miller Bros., Inc. Sec. 08, T. 29 N., R. 20 E. Blaine Co. KB 3,486 ft McCann Butte 7 2500521376 Roland S. Bond & Lone Star Exploration, Inc. 7-10 State Sec. 10, T. 29 N., R. 21 E. Blaine Co. KB 3,311 ft Wildcat 8 2500505002 Phillips Petroleum Company 1 Fort Belknap "A" Sec. 03, T. 28 N., R. 23 E. Blaine Co. KB 2,916 ft Twin Buttes 9 2500521833 Montana Power Company Tribal 8-11-2 Sec. 11, T. 29 N., R. 24 E. Blaine Co. KB 2,654 ft Wildcat 10 2500521828 Montana Power Company 6-15-3 Tribal Sec. 15, T. 30 N., R. 25 E. Blaine Co. KB 2,636 ft Wildcat 11 2507121147 Texas Gas Exploration Corp. 1-16 State Sec. 16, T. 30 N., R. 27 E. Phillips Co. KB 2,308 ft Wildcat 12 2507121087 Miami Oil Producers 1 Doucette Sec. 35, T. 31 N., R. 28 E. Phillips Co. KB 2,706 ft Wildcat TD 2,048 ft Cretaceous Eagle Sandstone Drilled and Abandoned No DST TD 2,290 ft Mississippian Madison Limestone Drilled and Abandoned No Cretaceous DST TD 3,659 ft Devonian Cook Lake Formation Drilled and Abandoned No Cretaceous DST TD 7,074 ft Precambrian Drilled and Abandoned No Cretaceous DST TD 3,958 ft Mississippian Mission Canyon Formation Drilled and Abandoned DST: 1,980-2,097 (Greenhorn, Phillips); open 15 min., SI 30 min., open 60 min., SI 60 min.; rec. 90 ft mud; FP 90-109, SIP 569-463, HP 1,069-1,022 DST: 3,314-3,346 (Kootenai); open 15 min., SI 30 min., open 60 min., SI 60 min.; rec. 60 ft mud; FP 45-81, SIP 1,739-1,735, HP 1,798-1,763 TD 2,359 ft Cretaceous Belle Fourche Shale Drilled and Abandoned DST: 2,022-2,359 (Greenhorn, Belle Fourche); open 15 min., SI 30 min., open 30 min, SI 60 min; rec. 125 ft mud; FP 204-204; SIP 771-771; HP 1,082-1,073 TD 1,872 ft Cretaceous Belle Fourche Shale Drilled and Abandoned No DST TD 2,725 ft Cretaceous Skull Creek Shale Drilled and Abandoned Perforated: 1,539, 1,543, 1,557, 1,564, 1,566, 1,577, 1,591, 1,594, 1,596, 1,605, 1,615, 1,835-39, 1,843, 1,846, 1,851 DST: 836-880 (Eagle); open 45 min., SI 60 min., rec 0.8 ft mud; FP 30, SIP 30, no other pressures reported. DST: 1,787-1,805 (Greenhorn, Phillips); SI 30 min., open 60 min., SI 60 min., rec. 420 ft SWTR; FP 187, SIP 597, no other pressures reported. DST: 2,160-2,206 (Mowry); open 45 min., SI 60 min., rec. 10 ft mud; FP 4, SIP 28, no other pressures reported. Volcanic rocks from 1,596 to surface Volcanic rocks from 558 to surface 1 Stratigraphic note: 1. Operator noted that volcanic rocks extend from surface to Judith River Formation at 849 ft 1 2 1 Stratigraphic note: 1. Operator's pick of Dakota Formation at 1,538 ft 1 2 3 4 1 2 Jurassic rocks 20 mi 8 mi 12 mi 10 mi 7 mi 11 mi 8.5 mi 6 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Morrison Formation 13 2507121060 Webb Resources 8-11 Federal Sec. 08, T . 31 N., R. 30 E. Phillips Co. KB 2,323 ft Wildcat 14 2507121058 Anschutz Corp. 1 Federal (987) Sec. 35, T. 32 N., R. 31 E. Phillips Co. KB 2,279 ft Bowdoin dome TD 1,693 ft Cretaceous Mowry Shale Drilled and Abandoned DST: 1,261-1,317 (Phillips); open 2 hr., SI 2 hr 25 min.; gas burned 2 ft flare; rec. 93 ft WCM, 535 ft GCMW; FP 100-266, SIP 538, HP 667-622 TD 2,300 ft Cretaceous Kootenai Formation Init. prod.: SI gas Prod. zone: Phillips sandstone 1,032-1,111 (gross) Perfs.: 1,032-38; 1,044-60, 1,099-1,111 DST: 820-980 (Bowdoin); open 7 min., SI 30 min., open 1 hr, SI 30 min.; rec 422 ft SWCM; FP 39-69, 109-188; SIP 297 DST: 1,000-1,075 (Greenhorn, Phillips); open 40 min., SI 40 min., gas in 10 min. @ 26.1 MCFGPD, incr . to 43.9 MCFGPD in 40 min.; rec. 240 ft SWCM; FP 59-99, FSIP 386, HP 485-465 Stratigraphic note: 1. Operator's pick of Blackleaf Formation at 338 ft 2. Operator's pick of Bow Island Formation at 993 ft 3. Operator's pick of Kootenai Formation at 1,452 ft Stratigraphic note: 1. Operator's pick of Telegraph Creek Formation at 1,038 ft 2. Operator's pick of Belle Fourche Shale at 2,077 ft 3. Operator's pick of Thermopolis Shale at 2,243 ft 4. Operator's pick of Bow Island Formation at 2,555 ft 5. Operator's pick of Dakota Formation at 2,872 ft 6. Operator's pick of Swift Formation at 3,195 ft Stratigraphic note: 1. Operator's pick of Muddy Sandstone at 2,736 ft 2. Operator's pick of Dakota Formation at 3,013 ft 3. Operator's pick of Cat Creek Sandstone at 3,278 ft Phillips sandstone (subsurface usage) Bowdoin sandstone (subsurface usage) A' EAST Judith River Formation Claggett Shale Gammon Shale Niobrara Formation Carlile Shale Greenhorn Formation Belle Fourche Shale Muddy Sandstone Skull Creek Shale Basal silt unit of Skull Creek Shale Fall River Sandstone Kootenai Formation Formation Series UPPER CRETACEOUS LOWER CRETACEOUS Wells on Fort Belknap Indian Reservation 9 mi 10 mi 0 100 200 300 400 500 600 700 800 900 1000 FEET 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 21 22 23 24 25 26 27 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Volcanic rocks from 849 to surface 3 Coburg syncline Bowdoin dome 1 2 Stratigraphic note: 1. Operator's pick of Fish Scale sandstone at 1,228 ft 2. Operator's pick of Dakota Formation at 2,103 ft Mosby Sandstone Member Intersects cross section D-D' Mowry Shale 2 2 1 2 2 2. Operator's pick of Swift Formation at 1,840 ft Group Colorado Group Montana Group Group Colorado Group Montana Group or Member DIGITAL DATA SERIES DDS-57 PLATE 2 Judith River Formation Judith River Formation Judith River Formation CROSS SECTION A-A', FROM THE ROCKY BOYS INDIAN RESERVATION TO BOWDOIN DOME, NORTHEASTERN MONTANA STRATIGRAPHIC FRAMEWORK OF LOWER AND UPPER CRETACEOUS ROCKS IN CENTRAL AND EASTERN MONTANA By Steven M. Condon 2000
